Outward Appearance

Silver/chromeish/mirrorlike with occasional flows of colors/patterns over it.

Eye Colour

Solid black eyes, no whites or apparent iris at all, and hardly any reflection. Looking into hir eyes is like looking into a lightless void.

Outstanding Features

Although draconic, sie lacks both wings and a breath weapon.

Personality & Background

Personality

Quietish, often, well, geeky. Sometimes overly cheerful/bubbly.

Background

Now that would be telling.

Likes

Being friendly, gentle, nice, "affectionately nasty" (to those that like it), and has a thing for macro/micro watersports as long as the size difference is sufficiently large.

Additional Info

In addition to being a sizeshifter (non instantaneous though, takes time), has some limited shapeshifting ability. (Stuff like emphasizing/demphasizing (ie, growing/shrinking) various features, switching between bipedal and quadrapedal, and suchlike.) This includes color shifting, including the ability to display complex moving patterns/shapes (Hence see above.)
(Additional note: Sie can't be quadrapedal any smaller than ~21ft, and can't be bipedal any larger than ~125ft)